sjwilliams

Source: http://mmb.pcb.ub.es/~carlesfe/unix/tricks.txt

I have marked with a * those which I think are absolutely essential
Items for each section are sorted by oldest to newest. Come back soon for more!

BASH
* In bash, 'ctrl-r' searches your command history as you type
- Input from the commandline as if it were a file by replacing 
  'command < file.in' with 'command <<< "some input text"'
- '^' is a sed-like operator to replace chars from last command 

sjwilliams

Sublime Text 2 – Useful Shortcuts (Mac OS X)

General

⌘T	go to file
⌘⌃P	go to project
⌘R	go to methods
⌃G	go to line
⌘KB	toggle side bar
⌘⇧P	command prompt

sjwilliams

find . -name '*.JPG' | awk 'BEGIN{ a=1 }{ printf "mv %s %04d.jpg\n", $0, a++ }' | bash;
ffmpeg -r 24 -f image2 -s 1920x1280 -i %4d.jpg -vcodec libx264 -crf 15 test.mp4

sjwilliams

umd(function(require, exports, module) {

//...

},'my-module');function umd(fn,n){
  if(typeof define=='function')return define(fn); // AMD
  if(typeof module=='object')return fn(require,exports,module); // CommonJS
  var m={exports:{}};window[n]=fn(function(n){return window[n];},m.exports,m)||m.exports; // window
}

sjwilliams

var Curl = require( 'node-libcurl' ).Curl;
var querystring = require( 'querystring' );
var IMGIX_API_KEY = '';

function imgixPurge(url){
  var curl = new Curl();        
  curl.setOpt(Curl.option.URL, 'https://api.imgix.com/v2/image/purger');        
  curl.setOpt('HTTPAUTH', Curl.auth.BASIC);
  curl.setOpt(Curl.option.USERNAME, IMGIX_API_KEY);
  curl.setOpt(Curl.option.TIMEOUT, 20);

sjwilliams

Array.prototype.slice.call(document.querySelectorAll('.a-span2 .value')).map(function(value){return Number(value.textContent.replace('$', '').trim())}).reduce(function(a,b){return a + b}, 0);

sjwilliams

#!/bin/bash

# Bash script to install latest version of ffmpeg and its dependencies on Ubuntu 12.04 or 14.04
# Inspired from https://gist.github.com/faleev/3435377

# Remove any existing packages:
sudo apt-get -y remove ffmpeg x264 libav-tools libvpx-dev libx264-dev

# Get the dependencies (Ubuntu Server or headless users):
sudo apt-get update

sjwilliams

Observables

You don't really need a framework or fancy cutting-edge JavaScript features to do two-way data binding. Let's start basic - first and foremost, you need a way to tell when data changes. Traditionally, this is done via an Observer pattern, but a full-blown implementation of that is a little clunky for nice, lightweight JavaScript. So, if native getters/setters are out, the only mechanism we have are accessors:

var n = 5;
function getN() { return n; }
function setN(newN) { n = newN; }

console.log(getN()); // 5

setN(10);

sjwilliams

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

sjwilliams

const isAutoplaySupported = function (callback) {
  var timeout;
  var waitTime = 200;
  var retries = 5;
  var currentTry = 0;
  var elem = document.createElement('video');
  var elemStyle = elem.style;

  function testAutoplay(arg) {
    currentTry++;